Electronic clock



FIG. 1 is a front elevational view of an electronic clock showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof. 

the ornamental design for an electronic clock, substantially as shown. 